LU-9810 lnd: use less CQ entries for each connection

LU-9810 lnd: use less CQ entries for each connection

Currently we have a 2 work requests chains per transfer.
It mean OFED stack will generate only 2 events if transfer will
faild. Reduce number CQ entries to avoid extra resource consumption.

Test-Parameters: trivial
Seagate-bug-id: MRP-4508
Lustre-change: https://review.whamcloud.com/28279
Lustre-commit: 052f76bf708414b3a127aa9602b4a69415c1cb2f

Signed-off-by: Alexey Lyashkov <alexey.lyashkov@seagate.com>
Change-Id: I0c06fef9589478f40ef7e1eeacff2aec7013e562
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Tested-by: Jenkins
Reviewed-by: Doug Oucharek <dougso@me.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/33974
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Alexey Lyashkov <c17817@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>